From 4b4f0c529a81aad34c8e282fee1f3a79c4ab17c2 Mon Sep 17 00:00:00 2001
From: Edwin Noorlander <edwin@noorlander.info>
Date: Mon, 25 May 2026 17:59:15 +0200
Subject: [PATCH] Initial commit

---
 .gitignore  |   1 +
 Cargo.lock  | 435 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml  |   8 +
 RustDemo    |   1 +
 src/main.rs |  88 +++++++++++
 5 files changed, 533 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 160000 RustDemo
 create mode 100644 src/main.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..c7f6d8c
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,435 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "anyhow"
+version = "1.0.102"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7f202df86484c868dbad7eaa557ef785d5c66295e41b460ef922eca0723b842c"
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+
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+dependencies = [
+ "cfg-if",
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..f2ce1e4
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "sdl_demo"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+sdl3 = "0.18"
+rand = "0.10.1"
\ No newline at end of file
diff --git a/RustDemo b/RustDemo
new file mode 160000
index 0000000..aab05ac
--- /dev/null
+++ b/RustDemo
@@ -0,0 +1 @@
+Subproject commit aab05ac73a0a4ba9d8940a35360d13047fc876f8
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..987481b
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,88 @@
+use sdl3::event::Event;
+use sdl3::keyboard::Keycode;
+use sdl3::rect::Rect;
+use std::time::Duration;
+use rand::RngExt;
+
+const WINDOW_TITLE: &str = "Rust SDL3 Demo";
+const WINDOW_WIDTH: i32 = 800;
+const WINDOW_HEIGHT: i32 = 600;
+const BACKGROUND_COLOR: sdl3::pixels::Color = sdl3::pixels::Color::RGB(30, 30, 30);
+
+struct Ball {
+    x: i32,
+    y: i32,
+    velocity_x: i32,
+    velocity_y: i32,
+    radius: i32,
+    color: sdl3::pixels::Color,
+}
+
+impl Ball {
+    fn new(x: i32, y: i32, radius: i32, velocity_x: i32, velocity_y: i32, color: sdl3::pixels::Color) -> Self {
+        Self { x, y, velocity_x, velocity_y, radius, color }
+    }
+
+    fn update(&mut self, window_width: i32, window_height: i32) {
+        self.x += self.velocity_x;
+        self.y += self.velocity_y;
+        if self.x - self.radius <= 0 || self.x + self.radius >= window_width { self.velocity_x = -self.velocity_x; }
+        if self.y - self.radius <= 0 || self.y + self.radius >= window_height { self.velocity_y = -self.velocity_y; }
+    }
+
+    fn draw(&self, canvas: &mut sdl3::render::Canvas<impl sdl3::render::RenderTarget>) {
+        canvas.set_draw_color(self.color);
+        for dy in -self.radius..=self.radius {
+            let dx_sq = self.radius * self.radius - dy * dy;
+            if dx_sq < 0 { continue; }
+            let dx = (dx_sq as f64).sqrt() as i32;
+            let x1 = self.x - dx;
+            let y = self.y + dy;
+            let w = dx * 2 + 1;
+            let _ = canvas.fill_rect(Rect::new(x1, y, w as u32, 1));
+        }
+    }
+}
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let sdl = sdl3::init()?;
+    let video = sdl.video()?;
+    let window = video
+        .window(WINDOW_TITLE, WINDOW_WIDTH as u32, WINDOW_HEIGHT as u32)
+        .position_centered()
+        .build()?;
+
+    let mut canvas = window.into_canvas();
+    let mut event_pump = sdl.event_pump()?;
+
+    let mut randomgenerator = rand::rng();
+    let mut ball_1 = Ball::new(randomgenerator.random_range(0..WINDOW_WIDTH), randomgenerator.random_range(0..WINDOW_HEIGHT), 14, 4, 3, sdl3::pixels::Color::RGB(0, 255, 0));
+    let mut ball_2 = Ball::new(randomgenerator.random_range(0..WINDOW_WIDTH), randomgenerator.random_range(0..WINDOW_HEIGHT), 14, 4, 3, sdl3::pixels::Color::RGB(255, 0, 0));
+    let mut ball_3 = Ball::new(randomgenerator.random_range(0..WINDOW_WIDTH), randomgenerator.random_range(0..WINDOW_HEIGHT), 14, 4, 3, sdl3::pixels::Color::RGB(255, 0, 255));
+
+    'running: loop {
+        for event in event_pump.poll_iter() {
+            match event {
+                Event::Quit { .. } | Event::KeyDown { keycode: Some(Keycode::Escape), .. } => break 'running,
+                _ => {}
+            }
+        }
+
+        ball_1.update(WINDOW_WIDTH, WINDOW_HEIGHT);
+        ball_2.update(WINDOW_WIDTH, WINDOW_HEIGHT);
+        ball_3.update(WINDOW_WIDTH, WINDOW_HEIGHT);
+
+        canvas.set_draw_color(BACKGROUND_COLOR);
+        canvas.clear();
+
+        ball_1.draw(&mut canvas);
+        ball_2.draw(&mut canvas);
+        ball_3.draw(&mut canvas);
+
+        canvas.present();
+
+        std::thread::sleep(Duration::from_millis(1000 / 60));
+    }
+
+    Ok(())
+}